Means of guiding the endless belts in the drawing apparatus for textile rovings



will "7 1, IF. CASABLANCAS mfiw MEANS OF GUIDlNG THE ENDLESS BELTS IN THE DRAWING APPARATUS FOR TEXTILE ROVINGS Filed July 7, 1934 2 Sheets-Sheet l Am 9 IF. CASABLANCAS 9 9 MEANS OF GUIDING THE ENDLESS BELTS IN THE DRAWING APPARATUS FOR TEXTILE ROVINGS Filed July 7, 1934 2 Sheets-Sheet 2 Patented Apr. 7, 1936 PATENT OFFICE MEANS OF GUIDING THE ENDLESS BELTS IN THE DRAWING APPARATUS FOR TEX.-

TILE ROVIN GS Fernando Casablancas, Sabadell, Spain Application July '7, 1934, Serial No. 734,175 In Spain August 1, 1933 4 Claims.

This invention relates to drawing apparatus for textile rovings in which endless belts are employed to feed and hold up the roving. In these drawing apparatus a frame is generally used to guide the belts, this frame being formed by two lateral plates suitably joined together and preventing all lateral movement of the belts This frame furthermore is provided with rods which guide the front curve or belly of the belts near to the drawing rollers.

It is already a known thing with these frames to make the guide-rods of circular section attached to the frame, each independently of the other, for which purpose the ends of the rods, suitably shaped, engage in rectangular grooves formed in the plates which constitute the frame.

This arrangement was modified later on by constructing the guide-rods for the two belts formed by one single U -shaped piece and subsequently gave to the rods a section with sharpedges in order to avoid the rolling of the fibres round the rods.

The invention consists in a new improvement to these belt-guiding rods, this improvement being particularly suitable for those drawing apparatus in which very wide belts are used, as is the case in some types of mule spinning machines in which each pair of belts takes two to four rovings at a time. In these machines the frames that guide the belts are usually very close to each other and in consequence it is practically impossible to arrange in them the U-shaped guide-rods, owing to the great length that these rods must have and to the small space left between two adjacent frames for the insertion of the rods.

The improvement forming this invention consists essentially of guiding the front curve or bulge of the belts by means of independent guiderods or bars of flat shape, which engage in suitable grooves formed in the side plates of the frame in such a way that they remain pointing in a converging direction, that is to say, the planes of the rods remain in a direction approximately normal to the curve of the belts and the very pressure of these belts ensures the holding of the rods in the grooves in the frame plates. This arrangement enables the easy regulation of the pressure exerted by the belts on the roving by simply using rods of a different width.

This arrangement can be completed by forming in the upper part of the frame plates a further groove in which the upper rod can be placed in order to guide the upper belt from the exterior instead of doing so from the interior. By arranging three grooves in this way in each frame plate it is possible at will to guide the two belts from the interior or else to guide the lower belt from inside and the upper gbelt from outside.

In the adjoining drawings the improvements forming the object of this invention are represented.

Figure 1 a side view of a frame with a pair of belts guided in accordance with this invention.

Figure 2 is a crossrsection of this same frame throu h t e ine II--rI-I of Figu e Figure 3 is a horizontal section through the line III--III of Figure 1.

Figures 4 to 7 represent schematically one method of affixing the upper guide-rod, and

Figures 8 and 9 represent an alternative form for the guide-rods, inorder to vary the pressure exerted by the belts on the roving.

As can be seen from Figures 1 to 3, the frame is made up of two side plates I, which are fitted with grooves 2 in their front edge, in which grooves the guide-rods 3 engage. These guiderods 3 are flat and have at their extremities grooves to engage in the grooves 2 in the plates l, in such a way that once the rods are placed in their positions all lateral movement on the part of these rods is avoided.

The grooves 2 can be arranged in any suitable way in order to hold the guide-rods properly, but in order to facilitate the insertion of the upper rod it is convenient to join these two grooves 2 by a slit 6 of curved shape such as is shown in the drawings, in which case the two grooves are joined together and form one single groove with its outer edges inclined so as to form a support for the rods 3.

With this arrangement of the grooves, after the lower rod has been placed in position, the upper rod can be placed in position very simply by inserting it inside the belt in the upper part of the frame as is shown in Figure 4 and slipping it into its proper position in the way shown in Figures 5 to 7.

When the guide-rods have engaged in the grooves, they are pointing towards each other in a converging position and in such a way that the planes of the rods are approximately normal to the curve or belly of the belts. In this way the guide-rods have a better guiding efiect on these belts and in addition the pressure of the belts holds these rods properly engaged in the grooves 2.

By varying the width of the guide-rods 3, and thus the projection out of the grooves 2, the

edges of these two guide-rods become nearer or farther away from each other, so that by using rods of different widths it is possible to regulate the pressure exerted by the two belts together and on the fibres of the roving.

Another method. of regulating this pressure is that shown in Figures 8 and 9.

In these figures are shown the guide-rods l3 with their outer edges l4 curved in such a way that the same pair of rods can be placed in the two positions shown in Figures 8 and 9. As can be seen clearly from these figures, in the case of Figure 8, the edge surfaces of the rods which contact with the belts are in close proximity to each other and in consequence the belts exert a very great pressure on the roving, while in the case of Figure 9 those contact surfaces are relatively far apart and the belts exert a lesser pressure on the roving.

In addition to the two grooves 2 there can be formed in the upper part of the plates l another groove I (Figure 1) in which the upper rod 3 can also be inserted if it is desired to guide the upper belt from outside.

I claim:

1. In a drawing apparatus with endless belts for textile rovings comprising a framework including a pair of lateral plates supported spaced apart for guiding the belts, the front of said plates cut inwardly to provide converging diagonally disposed grooves, and bars having flat surfaces mounted between the plates and in said grooves with the front edges only of the same engaging the curved end portions of the belts whereby the pressure of said belts holds the bars in converging relation to one another.

2. In a drawing apparatus with endless belts for textile rovings comprising a framework including a pair of lateral plates supported spaced apart for guiding the belts, the front of said plates cut inwardly to provide converging diagonally disposed slots to receive bars of different widths, and a pair of removable bars having flat surfaces supported between said plates and in said slots with the front edges of the same contacting with the curved end portions of the belts whereby to hold the bars in converging position and to vary the distance between the front edges of the same for regulating the pressure of the belts upon the rovings.

3. In a drawing apparatus with endless belts for textile rovings comprising a framework including a pair of lateral plates supported spaced apart for guiding the belts, the front of said plates cut to provide a pair of converging diagonally disposed slots, and a pair of flat surfaced bars curved along the front edges mounted between said plates in said slots with the curved edges of the same selectively positioned for engaging the curved end portion of the belts whereby the said bars vary the pressure of the belts upon the rovings.

4. In a drawing apparatus with endless belts for textile rovings comprising a framework including a pair of lateral plates supported spaced apart for guiding the belts, an upper and a lower roller mounted adjacent the rear end of the plates to receive said belts, the opposite end of said plates cut intermediate the top and bottom thereof along the front end to provide a notch having an upper and a lower lip converging towards one another with an arcuate connection between the inner portions of said lips, and a pair of removable flat surfaced bars having front and rear edges and with outer ends extending beyond said plates, the said outer ends having portions cut away along the rear edges for guiding the same upon said arcuate connection when the free ends of said belts engage the front edges of said bars and move the same to abut said lips whereby the pressure of said belts holds the bars in converging relation to one another in said notches.

FERNANDO CASABLANCAS. 

